The thing is, could I write a new world design system and still use the Traveller terms for the UWPs (i.e. refer to them as "UWPs", lay it out like that, etc). And are specific dice mechanics closed content too (e.g. using 2d6-2 or 2d6-7+something in a new system)?
I also can't imagine you're going to lay claim to general terms like size, atmosphere, hydrographics, population, government, law, tech level, and starport. Or do I have to make up entirely new terms and use entirely different dice rolls for those? (it would be really silly if I have to come up with another word for "government").